Air impurity remover



NOV. 1951 s. J.ERLING 5 1 2,574,552

AIR IMPURITY REMOVER Filed May 4, 1949 INVENTOR. Sven yoizan {Jr/[n gwMNM Patented Nov. 13, 1951 AIR IMPURITY REMOVER Sven Johan Erling, Nockeby, Sweden, assignor to Aktiebolaget Separator, Stockholm, Sweden, a corporation of Sweden Application May 4, 1949, Serial No. 91,37

In Sweden May 4, 1948 This invention relates to air impurity removers and more particularly to an improvement for removin impurities from the atmospheric air passing into a pneumatic pulsator, or the like.

In the use of milking machine pulsators, ithas been found necessary to purify the atmospheric air passing through the pulsator. For this purpose, it is common practice to use. a filter consisting of a metal wire straining cloth which is coveredand held in place: by a perforated metal top, the latter in turn being fixed by means of one or more screws.

The pulsator is generally detachably secured to the cover of the milk pail, which isa part of the milking machine. The connection between the pulsator and the cover must be an air-tight one, and a packing is therefore generally provided between these parts.

The present invention has for. its principal object the provision of a very simple and at the same time very efficient air impurity remover; which is especially adaptedfor use in pulsators of the type mentioned.

A pneumatic pulsator made in accordance with the invention comprises two detachable members defining a long, narrow slot for admitting atmospheric air to an air intake channel in the pulsator. These members also form a larger channel or trough inside the slot and in which impurities passing through the slot are caught. The base surface of the pulsator housing, or a plane annular shoulder at the base of the housing, preferably serves as one of these members, and the other member may be a ring of such shape that the slot is formed between a thin outer edge of the ring and the aforementioned surface. The larger channel or chamber may be formed by an annular groove in the ring inside the edge which defines the slot.

With the new construction, a cyclone-action of the in-flowing air is obtained, so that those particles which can pass through the narrow slot are thrown out of the air current and deposit on the bottom of the groove, before the air reaches the air intake channel in the pulsator.

For a better understanding of the invention, reference may be had to the accompanying drawing, in which the single illustration is a side elevational view, partly in section, of one form of the invention embodied in a pneumatic pulsator.

The pulsator housing I contains a mechanism (not shown) for establishing pneumatic pulsations, the mechanism being operated by the pressure diiferential between a vacuum line, to which a nipple la is adapted to be connected, and at- 9. Claims. (01. 183-80).

mospheric air in an intake channel lb in the housing. The pulsation mechanism may be of any conventional form and therefore is not illustrated, but it will be understood that the atmospheric air passes up through the channel lb into the interior of the housing where it operates the mechanism by the aforementioned pressure differential.

The housing member I is of generally circular shape in horizontal section and is provided at the bottom with a circular member or ring 2. As shown in the drawing, a vertical section of the ringv 2 is such that its outer edge, together with the base of the pulsator housing, forms a fine annular slot 3 through which the atmospheric air passesinto an annular trough or chamber 5. The chamber 5 is defined by the lower surface of the pulsator housing and by a groove in the upper surface of ring 2, the groove being semi-circular in cross-section. The chamber 5 extends along the slot 3 at a location beyond the slot reckoned in the direction of air flow, andthe bottom of the chamber 5 is located below the lower edge of the slot. The interior of the housing is in communication with chamber 5 through the vertical channel lb opening into the chamber through the lower surface of the housing. If desired, a plurality of channels similar to channel 1b may be spaced circumferentially around the housing. It will be observed that the chamber 5 is of greater Width than slot 3; that is, the distance across chamber 5, from side to side, is considerably greater than the spacing between the elongated edges of slot 3.

The ring 2 is held in place on the pulsator housing by a packing 4 of rubber, or the like, placed between the housing and a milk pail cover 1 to which the pulsator is fixed. The packing element 4 is of annular shape and projects into an annular groove 8 in a lower part or boss lc of the pulsator housing, so that the ring 2 is secured to the pulsator housing by the packing 4 when the.

pulsator is removed from the cover I. When the annular groove 5 is to be cleaned, the ringlis removed from thepulsator by taking the packing 4 out of the groove 8, after the pulsator has been removed from the cover.

In the operation of the device, particles in the air whichare too large to pass through the slot .3 are caught in the slot, while smaller particles follow the air "current through the slot 3 into the chamber 5. Since most of the air must flow circumferentially along the annular groove or chamber 5 to reach the air intake channel lb, a whirling action occurs in this chamber. That is, the

3 air present therein is kept in rotation the same as in a cyclone type of impurity remover. The impurities are therefore separated out and retained in the groove in the ring 2 which forms the chamber 5.

I claim:

1. In combination, a pulsator housing having an air intake channel, a member disposed at the lower part of the housing and at least partly defining a long, narrow slot for admitting air to the channel, said member also at least partly defining a trough extending along the slot and located beyond the slot reckoned in the direction of air flow, the trough being located at the lower end of the channel in communication with both the channel and said slot and providing a deposit space for impurities in the air flowing from the slot along the trough to the channel, and an element releasably securing said member to the housing.

2. A combination according to claim 1, in which the housing has a lower boss extending through said member and to which boss said member is releasably secured, said slot and trough being generally annular and extending at least partly around the housing.

3. A combination according to claim 1, in which said element is a packing ring.

4. In combination, a plusator housing of generally circular form having an air intake channel opening through a lower surface of the housing, a removable ring defining with said surface a narrow slot extending around the housing for admitting air to said channel, the ring and housing also defining an annular trough extending along the slot and located beyond the slot reckoned in the direction of air flow, the trough communicating with the lower end of the channel and providing a deposit space for impurities in the air flowing from the slot around the trough to the channel, and an element releasably securing the ring to the housing.

5. A combination according to claim 4, in

which the housing has a lower boss projecting through the ring and having a peripheral groove, said securing element being a packing ring held in the roove.

6. In a pneumatic pulsator, the combination of a pulsator housing of generally circular form having an air intake channel, a generally annular removably secured to the housing and partly defining a long, narrow slot extending at least partly around the housing for admitting air to the channel, said member also at least partly defining a generally annular trough extending along the slot but located inwardly from the slot toward the center of the housing and beyond the slot reckoned in the direction of air flow, the trough connecting the slot with said channel and being of greater width than the slot, whereby impurities in the air passing through the slot are deposited and retained in the trough as the air flows along the trough to said channel.

'7. A combination according to claim 6, in which said slot is defined at its lower edge by said member and at its upper edge by the housing.

8. A combination according to claim 6, in which said channel extends upwardly from the trough and into the interior of the housing.

9. A combination according to claim 6, in which the bottom of the trough is located below the lower edge of the slot.

SVEN JOHAN ERLING.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,523,916 Tompkins Jan. 20, 1925 FOREIGN PATENTS Number Country Date 623,194 France Mar. 14, 1927 365,477 Germany Dec. 15, 1922 Certificate of Correction Patent No. 2,574,552 November 13, 1951 SVEN J OHAN ERLING It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Qolumn 4, line 8, before removably insert the word member;

and that the said Letters Patent should be read as corrected above, so that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 12th day of February, A. D. 1952.

THOMAS F. MURPHY,

Assistant Commissioner of Patents. 

